if this document can understand the (only one main function, available to the ve...

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如果能够把这个文件看懂了（只有一个main函数，可用到的C知识非常深奥），那你的C语言就到家了。非常值得学习。-if this document can understand the (only one main function, available to the very esoteric knowledge C), then you are on the C language of the home. Very worth learning.